GM Service Manual Online
For 1990-2009 cars only

Diagnostic Starting Point - Variable Effort Steering

Begin the system diagnosis with the Diagnostic System Check - Variable Effort Steering. The Diagnostic System Check will provide the following information:

    • The identification of the control modules that command the system
    • The ability of the control modules to communicate through the serial data circuit
    • The identification of any stored diagnostic trouble codes (DTCs) and their status

The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.